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1、装配钳工鉴定初级试题及答案（Assembly fitter identification of primary examination questions and answers）First, individual choice (first questions seventieth questions). Choose a correct answer and put the corresponding letters into the brackets in the questions. 1 points per game, 70 points. )1. violation of safe
2、ty procedures is (D).A, strictly abide by production disciplineB and follow safe operating proceduresC, the implementation of the national labor protection policyD, can use unfamiliar machine tools and tools2., keep the working environment clean and orderly, not correct (C).A, a clean work environme
3、nt can inspire staff spiritB and optimize the working environmentC, after the end of the work, and then remove the oilD, semifinished material, semifinished product, according to the regulation piles up neatly3. for the rotating view, the following statement is incorrect (B).A, the tilted part needs
4、 to be rotated first and projected back, and the projection should reflect the actual length of the inclineThe B and rotation views apply only to the shape of all tilted structuresC, rotate view without any calloutD, assuming that the tilt of the component rotates to a parallel to a selected basic p
5、rojection surface and then projected to the projection surface, the resulting view is referred to as a rotating view4., the basic size is standardized for (D).A and simplify the design processB, easy to design calculationC, measurement of convenient sizeD, simplified specifications for tools, gauges
6、, profiles and parts dimensionsThe carbon content of 5. nodular cast iron is (C).A, 2.2% 2.8%B, 2.9% 3.5%C, 3.6% 3.9%D, 4% 4.3%6. vernier calipers with two jaws at the top are used for measuring (A).A, inner holeB, grooveC and gear normal line lengthD, outside diameter7. machine hinge, should make t
7、he workpiece (A) clamping, drilling and reaming work, in order to ensure the center line of reamer and drilling center line consistent.A, onceB, two timesC, three timesD, four times8. plate braces threads, when the cutting part of the die into the workpiece, two handed force to (C) rotation, lateral
8、 pressure can not have.A, largerB, bigC, uniform and smoothD, smaller9., the incorrect description about low-voltage circuit breakers is (A).A does not have overload protection functionB, easy to install and use, adjustable movement valueC, safe operation and reliable workD, used in circuits that do
9、 not frequently turn off10. it is (D) that the safety measures are not met.A, FireWire must enter switchB, reasonably choose lighting voltageC, choose wire and fuse reasonablyD and mobile appliances do not have to be grounded11., the common sense that does not conform to safety in production is (D).
10、A wear protective articles as requiredB, clear chips, use toolsC, clean oil and water at any timeD, channel up and down less itemsThe 12. CA6140 lathe (B) drive chain is transmitted to the spindle in the spindle box by the motor through a V belt pulley.A and auxiliary movementB, main movementC and f
11、eed motionD, cut in motion13. known spur gear m=5, z=40, the gear diameter of the pitch circle is (A) mm.A, 200B, 210C, 187.5D, 197.5The material of the 14. slide valve sleeve is high quality (C) steel.A, carbon junctionB, toolsC, alloyD, high-speedThe surface roughness of the 15. spool valve is (B)
12、 mu m (mating surface).A, Ra0.02B, Ra0.025C, Ra0.03D, Ra0.03516. when compiling the assembly process specification, the raw data is required (A).A, blank dataB, process cardC, process cardD, parts list17. (A) a process document that describes the process process.A, process cardB, process cardC, step
13、 cardD, tooling card18. the interchangeable assembly method must guarantee the square root (C) assembly tolerance of the sum of squares of the tolerance values of the parts concerned.A greater thanB, less thanC, less than or equal toD equalsScreening of the key parts of 19. T68 spindle assembly, par
14、ts of the master error and the maximum error of the direction of using the method of error of the phase offset (D) assembly.A, swapB, optionalC, repairD, directional20. a unit (D) unit that can be assembled independently.A, independentB, partsC, componentsD, assembly21. itself is a component that is
15、 used to connect the parts or components that need to be put together (D).A, componentsB, partsC, reference partsD, reference components22. components directly into the assembly are referred to as D.A, partsB and subassemblyC, componentsD, sub components23. components directly into components (B) ar
16、e referred to as primary division components.A, adjustB, assemblyC, machinesD, assemblyOne of the main functions of the 24. assembly unit system diagram is to clearly represent the product (D).A, machining processB, processC, production processD, assembly process25. represents the assembly sequence
17、(C) of the assembly unit.A, system diagramB and component assembly system diagramC and assembly unit system diagramD and assembly drawingTwenty-sixThe assembly unit, which is the first to assemble, is called assembly (A).A, benchmarkB, partsC, componentsD, standard components27. assembly process doc
18、umentation has assembly (D).A and parts drawingB, manufacturing processC, production equipmentD and time quota sheet28. process specification, machining procedure and (C) process specification.A, equipmentB, toolingC, assemblyD, machines29. quality requirements of process specifications must meet th
19、ree requirements of product (D), high yield and low consumption.A, accuracyB, lifeC, costD, qualityThe basic principles of the 30. components (C) are: first, after, first, inside, after, and from initiative to passivity.A, processing technologyB, processC, assembly programD, manufacturing process31.
20、 profiled workpiece prior to the placement method, there are (C) support palm workpiece.A and location blockB, locating plateC and dowel pinD mandrel32. by using the method of block moving coordinate drilling machining high precision hole hole distance, should have two each (C) processing as a refer
21、ence surface.A, parallelB, tiltC, verticalD, crossover33. scraping is a kind of precision processing, every scraping knife removal margin (D), generally will not produce waste.A, largerB, generalC, smallerD, very smallThe 34. rotating body in the operation of both the centrifugal force and moment (A
22、) called dynamic unbalance.A, centrifugalB, centripetalC, balanceD and exercise35. pouring Babbitt bearings first clean the base of the bearing shell and then cast the surface (A) to the base of the bush.A, tin platedB, chrome platedC, zinc platingD, plating36. hydraulic transmission can not (C).A,
23、stepless speed regulation is realizedB delivers greater torqueC, ensure strict transmission ratioD, implementation automation37. control valve is the hydraulic system (B) components.A, reversingB, controlC, pressureD and energy storage38. (A) does not belong to hydraulic components.A, superchargerB,
24、 oil filterC, pressure gaugeD, accumulator39. the loop that uses pressure control to control the system pressure is (B).A and direction control loopB, pressure control circuitC, speed control loopD, synchronous circuit40. hydraulic system temperature is too high because the hydraulic pump efficiency
25、 is low, the system pressure loss, system design is unreasonable and (D).A and overflow valve malfunctionB, hydraulic pump failureC, system oil leakageD, poor heat tankThe most common of the 41. planar linkages is (A).A and four bar linkageB and two bar linkageC and three bar linkageD and symmetric
26、mechanism42. the pressure angle at each point of the cam contour line is (B).A, immutableB, changingC, equalD, zero43. (B) used to support rotating parts, that is, only by bending instead of transmitting power.A, rotating shaftB mandrelC, transmission shaftD, crankshaftThe 44. pin is used mainly to
27、secure the B between the parts.A and distanceB, relative positionC, assembly dimensionsD and relative displacement45. clutch is mainly used between the shaft and shaft during the machine running (C) and engagement.A, limited speedB makes the two axles turn the sameC, separationD, stop a shaft46. sli
28、ding bearings mainly by the bearing seat, bearing, fastening screws and (C) and so on.A, supportB, bearing sleeveC lubrication unitD axis47. human error (B) error.A, bulkyB, generalC and measurementD, processing48. gross error belongs to (B) error.A, environmentB, operationC and MetrologyD and measu
29、rement49., under the same condition, the error of the same value, the value of the error and the sign according to a certain law are measured several times, and the error (C) error is changed.A, artificialB, randomC and variable valuesD and method50. with high block, and the dial indicator (A) with
30、the use of longitudinal and transverse test of milling machine worktable moving on work surface parallelism.A, rulerB, rulerC, dial indicatorD, calipers51., the specific reasons for the deformation of machine tools are (A).A, designB, installC and fitD, combine52., the actual contact area between th
31、e parts is smaller than the specified contact area, it can be said that parts of the contact (A) difference.A and stiffnessB hardnessC, strengthD, toughness53., some parts of the machine tool wall thickness is thin, after the force is easy to produce (A).A, deformationB and ruptureC, faultD and exer
32、cise54. the external heat source of machine tools is mainly heat (A).A, radiationB, transferC and conductionD, balance55. the vibration of machine tool motor belongs to machine tool (C) vibration source.A, internal causeB and internal forceC, internalD, external56., the frequency range of noise is m
33、ostly in (D).A, 10HZ40HZB, 40HZ60HZC, 80HZ100HZD, 40HZ10HZFifty-sevenThe error of parts (D) is caused by the error caused by the thermal deformation of the process system.A and MetrologyB, useC and measurementD, processing58. clamping errors include clamping error, reference displacement error and (
34、C) misalignment error.A, base surfaceB, standardC, benchmarkD, foundation59. machine tool errors include (C) errors.A, machine toolB, machine tool fixtureC, machine spindleD, machine tools, measuring tools60. the effect of tool error on the machining accuracy varies with the tool (A).A, different ki
35、ndsB, sizeC, usesD, performance61., the process system produces deformation and displacement under the strong action, and the workpiece geometry and dimension (D) are caused when the workpiece is machined.A, tolerancesB and deviationC and upper differenceD, error62. the process system is subjected t
36、o force (A).A, cutting forceB and forceC, transfer forceD, making power63. objects after the force (B) includes two aspects: first, the object itself deformation, and two is the deformation of the object contact surface.A and displacementB, deformationC and changeD, move64. one of the factors affect
37、ing the stiffness of the process system is B.A, more importantB, majorC, secondaryD, secondary65., when finishing, the cutting depth and feed is small, the cutting force and deformation are small, which can be corrected by rough machining (D).A and upper differenceB and lower differenceC, tolerances
38、D, error66. processing system caused by heating deformation (D), there is thermal deformation of the workpiece.A, tolerancesB and upper differenceC and lower differenceD, error67., the mistake in reducing the thermal distortion error is, (B).A the workpiece is processed in a constant temperature cha
39、mberB, processing the work outdoorsC, preheat the machine before processing, so that it can be processed in the heat balance stateD, sufficient cooling during processing to reduce temperature riseThe 68. overflow valve is clogged with damping holes to cause hydraulic pressure (D) in the hydraulic sy
40、stem when the hydraulic shaper is turned by air.A, ultra highB, ultra lowC, too lowD, too high69. the vertical feed rate of the grinding table is too high, or the line speed of the workpiece and the choice of the line speed of the grinding wheel will cause the defects (C) of the workpiece to be mill
41、ed.A, not bright and cleanB, scratchesC, helixD and high roughness70. universal cylindrical grinding machine workpiece surface roughness of the fish scale, one of the main reasons for the defect is the use of grinding (A).A, improperB, not goodC, more inappropriateD, not so goodTwo, judgment questio
42、ns (seventy-first questions 100th questions). Fill the parentheses with the result of the judgment. Fill in the V right and wrong fill *. 1 points per game, 30 points. )71. (V) occupation morality is the manifestation of social morality in the occupation and occupation behavior in the relationship.7
43、2. (V) to comply with the law, integrity is every practitioner should have the moral quality.73. (V) practitioners must have law-abiding integrity and moral quality.74. (x) in the dimension symbol phi 50F8, the tolerance code is 50F8.75. (x) bearing alloy does not need to have good thermal conductiv
44、ity and corrosion resistance.76. (x) chain transmission is a transmission and power transmission consisting of a chain and a driven wheel with a special toothed form.77. (x) the basic requirements of tool materials are two items with good manufacturability and wear resistance.78. (x) carbon tool ste
45、el and alloy tool steel are characterized by good heat resistance, but high bending strength and low price.79. (V) according to the cursor universal angle ruler reading value can be divided into 2 and 5 two.80. (V) speedreducer process divided into plane processing, and the side of the bearing hole in two stages.81. (x) pr